Asked by McKenna Louise
Use the law of cosines to show that the measure of each angle of an equilateral triangle is 60deg. Explain your reasoning.
Answers
Answered by
Steve
since the sides are all equal,
s^2 = s^2+s^2 - 2s^2 cosθ
cosθ = 1/2
since you can pick any side, the value for θ is good for all three angles.
s^2 = s^2+s^2 - 2s^2 cosθ
cosθ = 1/2
since you can pick any side, the value for θ is good for all three angles.